Draft rigging



May 8, 1923.

G. L. HARVEY DRAFT RIGGING Filed Jan. 1922 3 Sheets-Sheet l Jmw May 8, 1923.-

G. L. HARVEY DRAFT RIGGING Filed Jan. 7, 1922 a Sheets-Sheet 2 G. L. HARVEY May 8, Y 1923.

DRAFT RIGGING 3 Sheets-Sheet 5 Filed Jan. 7 1922 Patented May 8, i923.

tees

GEORGE L. HARVEY, OF CHICAGO, ILLINOIS.

DRAFT RIGGING.

Application filed .1 anuary 7, 1922.) Serial No. 527,571.

To all whom it may concern:

Be it known that I, GEORGE L. HARVEY, a citizen of the United States, and resident of Chicago, in the county of Cook and State or Illinois, have invented certain new and useful Improvements in a Draft Rigging, of which the following is a specification.

My invention relates to draft rigging or butting devices for railway cars and particu- 1o larly to a novel friction rigging having peculiar advantages not found in the devices heretofore proposed.

One of the objects of my invention is to provide a frictional draft rigging in which the frictiondevices are all self contained and each element of the shock absorbing devices is a unit. The result is that even under the most extreme loads there is no tendency towards bursting of any of the parts. In friction devices of the barrel type it is practically impossible to so construct the friction producing devices as to prevent breakage under extreme loads. Furthermore there is a strong tendency in devices of this sort, after wear has taken place, to stick; that is, to fail to return to initial position following the application of a load.

In the device of my invention there is no spreading or bursting tendency of any of the parts; neither is there any possibility of failure to return to initial position.

Another important advantage in my construction is that the frictional resistance is progressively cumulative, the friction increasing with the increase ot" area of the parts in contact.

The device is capable of the widest variation in capacity, the number of plates employed and the angle of bending of the respective plates serving to determine the total capacity, as well as the responsiveness thereof to initial light loads.

My invention will be more readily nnderstood by reference to the accompanying drawings, in which:

Figure 1 is a side view of a draft rigging constructed in accordance with my invention;

Figure 2 is a plan view thereof;

59 Figure 3, 4, and 5 are end. edge and top views respectively of one of the plates prior 4 to the first bending operation;

Figures 6, 7, and 8 are end, side and bottom views respectively of one set of plates in their completed condition: and

Figures 9, 10, and 11 are similar views of a completed cooperating late.

In the drawings it Wlll be seen thatl provide frontand rear follower blocks 10, 11 respectively, the block 10 having a triangular recess 12 in the face thereof while the block 11 has a correspondingly shaped proect1on 13 on its face. The blocks are suitably cored out and are provided with side openings 15, 15 for the accommodation of longitudinally extending headed bolts l6,

17 which serve to retain the friction platesin place. A draw bar strap, not shown, or similar means. for communicating the draw bar movement to the follower blocks will be provided in the usual manner.

T he friction plates, best shown in Figures 3 to 11 inclusive, are of peculiar construction. The plates, at their initial stage of manufacture are of rectangular outline and are provided with oppositely disposed notches 18, 18 extending inwardly from the ends andarrangcd with their axes in alignment. The plates have a central portion 19 of uniform thickness and side portions which taper from the central portions to their margins. The side. portions are intersected by the notches, thereby forming wings 20-20, 21-21, on

- on each side of a notch. The plates when so formed are next subjected to a bending operation whereby they assume the. angular shape shown in Figures 6 and 9, the bend tak ing place along a longitudinal line coincident with the longitudinal axis of the notches 18.

In the next operation the wings 22-22, 23- 99 23, ot' the plates, shown in Figures 6 to 8 inclusive, are laterally deflected or curved outwardly; that is to say, the thinned ends of the wings as viewed in Figure 6 are bent upwardly.

The opposite action takes place in preparing the cooperating plates shown in Figures 9 to 11 inclusive, the wings 24-24, 25 being bent inwardly, or. as viewed in Figure 9, bent downwardly. The plates are composed 109 of spring metal and after being prepared as described are assembled,as shown in Figures 1 and 2, the respective plates being so associated that they cooperate in pairs, the

deflected marginal portions of the wings of 5,, the respective plates of a pair being in conshaped projection and recess respectively,

and V-sha-ped friction plates arranged'in pairs, each side arched whereby portion of each plate being when assembled the margi- 5 nal edges only of the plates of a pair are normally in contact and the middle portions of the plates of said pairs are in contact with the middle p ortions of plates of an adjacent pair, the area of contact and frictional resistance to relative sliding movement between all said lates increasing progressive- 1y as the arch in the plates is reduced under pressure.

Signed at Chicago, Illinois, this 4th day of January, 1922.

GEORGE L. HARVEY. 

